2 spacing-engraver.cc -- implement Spacing_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "musical-request.hh"
11 #include "paper-column.hh"
13 #include "spacing-spanner.hh"
14 #include "engraver.hh"
25 Rhythmic_tuple (Grob_info i
, Moment m
)
30 static int time_compare (Rhythmic_tuple
const &, Rhythmic_tuple
const &);
34 Acknowledge rhythmic elements, for initializing spacing fields in
37 should be the last one of the toplevel context
39 class Spacing_engraver
: public Engraver
41 PQueue
<Rhythmic_tuple
> playing_durations_
;
42 Array
<Rhythmic_tuple
> now_durations_
;
43 Array
<Rhythmic_tuple
> stopped_durations_
;
47 VIRTUAL_COPY_CONS (Translator
);
48 virtual void acknowledge_grob (Grob_info
);
49 virtual void start_translation_timestep ();
50 virtual void stop_translation_timestep ();
51 virtual void initialize ();
52 virtual void finalize ();
58 compare (Rhythmic_tuple
const &a
, Rhythmic_tuple
const &b
)
60 return Rhythmic_tuple::time_compare (a
,b
);
64 Rhythmic_tuple::time_compare (Rhythmic_tuple
const &h1
,
65 Rhythmic_tuple
const &h2
)
67 return (h1
.end_
- h2
.end_
).main_part_
.sign ();
70 Spacing_engraver::Spacing_engraver ()
76 Spacing_engraver::initialize ()
78 spacing_p_
=new Spanner (get_property ("SpacingSpanner"));
79 Spacing_spanner::set_interface (spacing_p_
);
80 spacing_p_
->set_bound (LEFT
, unsmob_grob (get_property ("currentCommandColumn")));
81 announce_grob (spacing_p_
, 0);
85 Spacing_engraver::finalize ()
87 Grob
* p
= unsmob_grob (get_property ("currentCommandColumn"));
88 spacing_p_
->set_bound (RIGHT
, p
);
89 typeset_grob (spacing_p_
);
94 Spacing_engraver::acknowledge_grob (Grob_info i
)
96 if (to_boolean (i
.elem_l_
->get_grob_property ("non-rhythmic")))
99 if (Rhythmic_req
* r
= dynamic_cast<Rhythmic_req
*> (i
.req_l_
))
101 Rhythmic_tuple
t (i
, now_mom () + r
->length_mom ());
102 now_durations_
.push (t
);
107 Spacing_engraver::stop_translation_timestep ()
109 Moment shortest_playing
;
110 shortest_playing
.set_infinite (1);
111 for (int i
=0; i
< playing_durations_
.size (); i
++)
113 Moment m
= (playing_durations_
[i
].info_
.req_l_
)->length_mom ();
116 shortest_playing
= shortest_playing
<? m
;
121 inf
.set_infinite (1);
123 for (int i
=0; i
< now_durations_
.size (); i
++)
125 Moment m
= now_durations_
[i
].info_
.req_l_
->length_mom ();
127 starter
= starter
<? m
;
129 playing_durations_
.insert (now_durations_
[i
]);
131 now_durations_
.clear ();
133 shortest_playing
= shortest_playing
<? starter
;
136 = dynamic_cast<Paper_column
*> (unsmob_grob (get_property ("currentMusicalColumn")));
138 SCM sh
= shortest_playing
.smobbed_copy ();
139 SCM st
= starter
.smobbed_copy ();
141 sc
->set_grob_property ("shortest-playing-duration", sh
);
142 sc
->set_grob_property ("shortest-starter-duration", st
);
146 Spacing_engraver::start_translation_timestep ()
148 Moment now
= now_mom ();
149 stopped_durations_
.clear ();
150 while (playing_durations_
.size () && playing_durations_
.front ().end_
< now
)
151 playing_durations_
.delmin ();
152 while (playing_durations_
.size () && playing_durations_
.front ().end_
== now
)
153 stopped_durations_
.push (playing_durations_
.get ());
156 ADD_THIS_TRANSLATOR (Spacing_engraver
);